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The ability of Mg-Fe layered double hydroxide to remove C. I. Reactive Red 2 from aqueous solution was investigated. The influence of molar ratio of Mg-Fe, solution pH, contact time and initial dye concentration on adsorption capacity of C. I. Reactive Red 2 was studied. Batch isotherm studies were carried out on a laboratory scale to evaluate the adsorption capacity of Mg-Fe layered double hydroxide...
Based on the strong affinities of Fe(III) and Al(III) to fluoride, four iron- aluminum hydroxide complexes were synthesized as adsorbents for the fluoride removal. Moreover, the adsorption experiments showed that all iron-aluminum complexes could adsorb aqueous fluoride effectively and with a high capacity. When an fluoride solution of 10 mg/L−1 was added with anyone of these complexes at pH 5.0–9...
The removal of ammonia from aqueous solutions using zeolites (ZFAs) synthesized from coal fly ash (CFA) as low-cost absorbent was investigated in a batch mode. When raw CFA was subjected to alkaline hydrothermal zeolite synthesis, the Zeolite X (ZFA-X) and zeolite A (ZFA-A) were formed. ZFAs had a much greater ability than CFA to remove ammonia. The pH strongly influenced ammonia removal by ZFAs....
The removal of reactive red 2 and methylene blue from aqueous solution was studied using soybean meal as an adsorbent. The effects of some parameters such as solution pH and contact time on the adsorption were investigated. The equilibrium time was found to be more than 60 min for equilibration. Equilibrium data conformed to the Freundlich, Langmuir and Redlich-Peterson isotherm models, where the...
Adsorption of 2, 4, 6-trichlorophenol onto octyl-modified ordered mesoporous silica material from aqueous solution has been investigated systematically using batch experiments in this study. Results indicate that 2, 4, 6-trichlorophenol adsorption is initially rapid and the adsorption process reaches a steady state after 1 min. The adsorption isotherms are well described by the Langmuir and the Freundlich...
The performance of low-cost adsorbent such as raw rice husk (RRH) fixed bed column in removing Pb2+ from aqueous solution are studied in this work. Different column design parameters like bed height, flow rate and initial concentration are calculated. It is found that bed height, flow rate and initial concentration were important parameters for evaluating the efficiency of sorbents in continuous treatment...
Adsorption of humic acid (HA) and Cu(II) onto cetyl pyridinium bromide (CPB) modified zeolite was investigated in single- and binary-adsorbate systems. The equilibrium adsorption data of HA and Cu(II) onto CPB modified zeolite in the single-adsorbate system were analyzed by the Langmuir and Freundlich isotherm models. The equilibrium adsorption data were well described by the Langmuir isotherm model,...
Batch experiments were carried out to determine the capacity of Pseudomonas fluorescens biomass to adsorb Sr(II) ions from aqueous solution with respect to pH, initial Sr(II) concentration, contact time and biomass dose. The FTIR results of Pseudomonas fluorescens biomass showed that biomass has different functional groups and these functional groups are able to react with metal ion in aqueous solution...
The present study was undertaken to evaluate the feasibility of Pseudomonas alcaligenes biomass for the removal of strontium ions from aqueous solutions. Batch experiments were performed to study the adsorption of strontium on pH, Pseudomonas alcaligenes biomass adsorbent with respect to initial Sr(II) concentration, contact time and biomass dose. The experimental data were modeled by Langmuir and...
A novel, bio-based sorbent for As(III), α-Fe2O3-impregnated chitosan beads (FICB), has been successfully synthesized and tested. Batch wise adsorption experiments were performed to evaluate the adsorption conditions, reusability as well as the effect of ionic strength and coexistence of other ions. The results indicated that the maximum adsorption capacity of FICB for As(III) was 4.46 mg/g at pH 5...
Wastewater containing Cadmium ion could be effectively removed by hydroxyapatite (HAP). Experimental results indicated that Cd removal percentage increased by increasing HAP dosage, solution pH, and reaction time. Cd removal percentage could approach 100%. There existed two stages from kinetic point of view. At the earlier stage, reaction rate was so fast that its kinetic process was intricate. At...
This paper has researched on the adsorption of Cr(VI) in water using peanut shell. The dependence on pH and Cr(VI) concentration of the adsorption was studied. Batch experiments results showed that the adsorptive capacity of peanut shell was 13.39 mg/g of adsorbent. The Langmuir and Freundlich models were used to describe the adsorption equilibrium of Cr(VI) on peanut shell and the adsorption followed...
The study evaluated the sorption of Zn(II) ions from aqueous solution by two low-cost materials, waste somatic and dead tea fungus. The rate and extent of accumulation were affected by pH, contact time and initial zinc ion concentration. The initial removal was rapid and equilibrium was established in less than 30 min. Good correlation coefficients were obtained when the pseudo-second-order kinetic...
The biosorption of strontium ions on beer yeast was investigated under the different adsorption conditions. The results of this study showed that the beer yeast has some abilities to adsorb Sr(II) from solution. Different variables, such as solution pH, contact time, adsorbent dose and initial strontium ions concentration influenced the adsorptive quantity. The process of biosorption has nearly reached...
The removal of U(VI) from aqueous solution by bamboo leaf was investigated. To compare the adsorption capability of untreated bamboo leaf and anionics-treated bamboo leaf, SDS was used as anion modifier. Variables of experiments including initial pH, concentration, contact time, adsorbent dose and temperature were studied. The results indicated that the adsorption capabilities are strongly influenced...
Removal of phosphorus from aqueous solution by steel slag column and the effects of the addition of boiler slag, furnace ash and quartz sand were investigated. After the adsorption treatment by the steel slag column, the residual phosphorus concentration was less than 0.5 mg/L. The adsorption performance of the steel slag column could be enhanced by the addition of quartz sand. The columns that were...
Humic acid (HA) was considered to be the main precursor of disinfection by-products (DBPs) in chlorination. In this study, an effective and economic method of preparing TiO2 film was successfully developed for adsorption of HA. The crystal structure and surface morphology of the TiO2 film were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). The effects of some factors such...
The removal of Cu2+ and Cd2+ of aqueous solution by residual sludge from four type sewage treatment plant was investigated. Effect of adsorption time, kinetics and thermodynamics of adsorption was researched. The study indicated that all of the sludge can absorb mono-component Cu2+ or Cd2+ but the sludge from Petrochemical Wastewater plant had deposition rather than adsorption on Cu2+ or Cd2+. The...
The fungal mycelial pellets of Aspergillus fumigatus was used for the removal of humic acid from aqueous solution. The impact of culture age, mycelial pellets preservation time, and different nutrition-cultured mycelial pellets on the biosorption of humic acid was studied. The results showed that humic acid could be adsorbed by Aspergillus fumigatus mycelial pellets. Sucrose could be a good cultivate...
Tobermorite is a mineral material with good ion exchange properties. The potassium feldspar ore from Lushi country is muscovite syenite. Potassium feldspar was hydrothermally decomposed with CaO as an additive, and then tobermorite nano-scale powder was synthesized. Based on the research work of our group, the adsorption property of tobermorite to Pb2+ from aqueous solution was studied. The factors...
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